Pulp-wood grinder.



` G. s. WITHAM, JR.

PULP WOOD GRINDER.

APPLIGATION FILED JUNE 12,1912.

Patented Apr. 1, 1913.

A EASI G. S. WITHAM, JR. PULP WOOD GRINDBR.

APPLICATION FILED JUNE 12,1912.

I,57,79l a Patented Apr. 1, 1913. l 4 SHEETS-SHEET 2. @a

Y K v G o o n l G. S. WITHAM, JR;

PULP WOOD GRINDER.

APPLICATION IILBD JUN12,1912.

Patented Apr. 1, 1913.

4 SHEETS-SHEET 3. l

G. S. WITHAM, JR. v PULP Woon GRINDER. APPLICATIONIILBD JUNE12,1912.

Patented Apr'. 1, 1913,

4 SHEETS-SHEET 4` rien.

GEORGE S. WI'IHAM, OF'HOOSICK FALLS, NEW YORK.

PULP-woon GRINDB.

rostfrei.

Specification of Letters Patent.

I Patented Apr. 1,1913..

Application led .Tune 12, 1912. Serial 1161,703362.

To all whom, t may concern:

Be it known that I, GEORGE S. WITHAM, Jr., a citizen of the United States, residing in IIoosick Falls, in the county' of Rensselaer and State of New York, have invented cer-v tain new and useful Improvements in Pulp- IYood Grinders, of which the following is a specication.

This invention relates to machines of t'he kind commonly employed to grindwood or other fibrous material used in the manufacture of paper pulp. The most. generally used machine of this class comprises a rotary grindstone against which the wood, contained in pockets, is pressed by followcrs operated usually by hydraulic power. .is the relatively large pieces of wood are ground the mechanical wood-pulp, as it is called, falls into a pit from which it is taken for further treatment. In these machines, however, as heretofore constructed, the walls of the pockets being of metal have necessarily 'been held out of contact with the stone and often the distance between the periphery of the stone and the adjacent edges of the pocket walls has been so great that chips, segments and small pieces of wood of various shapes and insufficiently ground have escaped the grinding operation and fallen into the pit with the properly ground pulp. These objections to the machines have been to some extent remedied by adjusting the pockets relatively to the stone, but such adjustments are difficultand are often neglecte A.

The primary object of my invention is to so improve the machine that the escape of improperly ground pieces is automatically' prevented. I haie invented a general way of accomplishing this result and also a number of specific devices which may be employed for this purpose. The general way is to provide linings or gates for the pockets which, while permitting the ground material to pass from the pockets, confine the unground material and 'prevent its escape to the pit. These linings or4 gates arepressedagainst the periphery .of the stone and are of such material that they arelth'emselves ground away`as the operation progresses. The linings or gates may be prsed against the stone by their own gravity, by hydraulic means, by mechanically-operated feed mechanism, and in various other ways, some of which are illustrated in the drawings and will-be hereinafter described.

Generally in this classof machines, wood is supplied to the pockets in the form of logs or blocks. My improved machine may be fed in this way, but it is also adapted to grind or regrind pulp-wood in various forms, residue from ground wood, sulte, sulfate, soda pulp, edgings, planks, deal ends, slabs, cornstalks, jute, hemp, etc., and what are known as pulp-screenings, i. e., the rejections or wastes from screening processes.

In carrying out my invention with these general objects in view, I have provided a machine embodying the characteristics above mentioned and which also contains some additional features, such as means for automatically feeding the material to be ground, means for prevent-ing the Iegrindin of the material and means for relieving t e fric tion often existing in this class of machines between the material and the side walls of the pockets.

In the accompanying drawings, Figure 1 is a view partly in side elevation and partly in sect-ion of a pulp-wood grinding machine embodying my improvements. Fig. 2'shows a vertical section thereof on the line 2 2 of Fig. 1. Fig. 3 shows a section of the same on the line 3-3 of Fig. ll Fig. 4 shows a. horizontal section on the line of Fig. 2. Figs, 6, and 7 show a modified form of the invention; Fig. 5 being a view j partly in end elevation, partly in section on the line 5-5 of Fig. 6 and with parts broken away to better illustrate other parts; Fig. 6 showing a section on the line 6-6 of Fig. 5g and Fig. 7 L'showing asecti'on on the line 7-7 of Fig. 5..;Figs. 8 and 9 show a further modification, Fig. 8 being' a view ,of part of the machine in side elevation and Fi 9 showing a section on the line 9-9 ofig.

.8. Fig. 10 isla detail View in vertical section illustrating another way of embodying my improvements; and Fig. 11 shows a horizontal section onthe line 1111 of Fi 10.5vv Figs. 12 and 13 are perspective views s ow.-l ing how 'the members'of the pocket cagate may be connected. '.Fig. 14 is a view y CMS-5 mi mac paftly in side elevation pz-u'ty and it' also @hmm mwhe the ha'xmg or gam of the pea a, detail View in verca' ses im? a palcMarij; i@ F l? it that 1n general ccnsitruffw k-L The pieces 0f Wood of varmls ,C pockfe Willis and 53H im@ 12h@ Vdec gaies 'I'fang "tor the pds WMC are pressd against the 'perp'mg T" g'nder and prevent the of 1 matera.

En ii. in A- he iffjower ur and i'n this; lnSiz-uca :auch plece of Wand constlilu h'nings *for fh@ the beards H against the periphery w that these me ground away om'n ngy' W@ the grinding away the Qczemngs @if lo th@ *fn-:fi:

era '5, 5,

moans for this purpose. The boar inside o; he pocket?, in but am 'The pocket; i5 provifled Wth'upght u' le Y. mis J' and @he beanie H am nri'f'angel 1U H is prfel its members -iou "v/"hw the bomds mf@ thus the maiera m be ground. is the pocket. che fellow@ is 'jy 'mwar th@ grndatone and l opmfaon proceed?, The :ffiipresses the maiela X. ew of the Stone, buf;- also ilus no large pieces 0f matera can -ape- :m h@ pxopery ground pu'p-wos 15; dewre to the; p, *1t-being @mi of acume, that the gatas or lmmggs H are @il matcrial which can pl'opely 1@ maxmfaeure of Wood pulp.

1s r omm'y in this clas of machines, uzfahy mi pockefs 1s preem'sly. am 1 ad and in such machines 1t often o'ccurs in miden pzevem this ma* pocket "a th@ @their and causal it miams@ irom ik@ machme MV nes@ wlpems ae aan o and s have 'ho boards, all of which is clearly :ed or an elevated posinoemer rial may be fed by hand, as is usiial7 but I prefer to employ a feed hopper L provided with a worm feed L. The walls of the pocket have openings m in them through which project toothed wheels M which are 'operated by gearing N and engage the boards H such manner as to press or eed the boards toward the rotary grinder A, or to exert such a pressure on the boards as to hold them in close contact with the grinder and prevent the escape of unground materia the drawings I have shown feed wheels M operating on boards in two sides or the poc-keb,- the boards on the other two sidesl m'aybe ted in any suitable way, their ownA weight or gravity being often sufficient.

In Figs. 8 and 9 I have shown still '1another way of arranging the linings or gates in the pocket. In this case gravity alone is depended on for holding the boards in conwith the grindstone. In Fig. 8 the devices Z2 are for the purpose oi adjusting the pockets radially toward and from the stone.

The walls or" the pocket are provided withvertical ribs J similar to those shown in Figs. 5 and for reducing friction and the poclret i provided with a swinging door 0 which Lday be secured iirmly in place by locking devices @ne of the boards may be inserted through an opening 0 in the pocket while the other three boards may be inserted through the iront door. After they are thus inserted and the material X is supplied,- A he door O may be closed and locked and then the machine may operate in the usual way, the boards being fed either by their own gravity or by being pressed toward the stoneby the follower, or in any other suitable way. I

In Figs. l() and 13 I have shown still another way of arranging the lining or gate. In this case I preferably use a rectangular frame P formed of strips of wood which may be mortised together in the manner inv dicated in Figs. l2 and lf3 and preferably one side of the frame is connected with a holderl` which carries bolts Q extending through parts g, ly of the frame between which are interposed springs R bearing against the part Q and against pins i" on the bolts7 the arrangnent being such that the springs press the holder Q toward the stone A and therefore holds the frame P in contact therewith. One side of the frame may be made in the form shown at the right hand ide of Fig. l0 and a. door It of the shape 'hewn may be employed. The part of the frame below the door may carry one or more bolts R2 connecting it with the frame and these bolts may be adjusted when required.

In machines of this Class the material to through doors which slide vertically in guides. I have found that material may be automatically fed to the pockets, when the latter are suitably constructed, by appropriate leed mechanism.

ln Fig. 14 I have shown constructions lsuitable for feeding either screenings. slivcrs` or other comparatively comminuted material, or for feeding logs or sticks of the usual kind and I have also shown the pockets equipped with linings. gates or guards made in accordance with my invention. The follower G is operated in the manner before described and may be raised above the mouth s of the hopper S containing a feed Screw S. The material may be delivered to the hopper S from pulp screens or in any other suitable way and fed into the pocket when the follower is in the raised position. Any suitable means may be employed for closing the l mouth of the poclget after the follower has descended. rIhe pocket may be lined or provided with gates like those before described, but in this inst-ance the gate or lining II is arranged in a recess in, one wall of the pocket and above rod T operated by hydraulic apparatus T2. The pressure exerted on the gate need not be as great as that exerted on the material X and in this way the life of the lining or gate may be prolonged. Sticks or logs of wood may be fed to the pockets in the manner indicated where U shows a hopper for holding the wood. The mechanism T, T. T2 is similar to that just described. The pocket may be provided with a door E of the kind hereinbefore mentioned and the follower may carry a gate V so arranged thatfwhen the follower' is raised the wood may fall into the pocket and when the follower descends the be closed.

Stone A by their own weight or gravity, suitable guides being formed in the pocket walls to receive them.

In Fig. 16 I have shown still another oonstruct-ion in which the gates or guards H are arranged outside the pockets being held in lplace by guides lV and pressed toward the stone A by means of set screws W which may be fromtime to time operated. v

It will thus be seen that my improvements may be applied in various ways to mahines of the most.A approved type with but little invention where the linings or gates are the other material to be ground great uniformity is effected in the grinding operation. In some machines of this class the side pressure and friction are .so great7 that the proper feeding of the material is not effected.

be ground is usually suoplied to the pockets o eninfr from the ho er to the oelretmay P s PP P modification thereof. In some forms of the In Fig. l5 the boards H are fed to the pressed; toward the stone simultaneously with(y i I find it most desirable to employ some1( y means for positively feeding or pressing thblgo iinings 0r inward rire stone, ont have @brained good resuirs wher@ gravity alone is depended upon for r'iiis pruposa,

Armti'ier desirabie feature o my improvanii-mi@ duit by providing -Iibs or simiiarl guides 'fur the iinings orgzrtes friction is largely reduced and better resuis Obtairied.

i vinili; as my invention: i

1. ik yxliiirwomi grinriiig machine, com l'risiug' n rra'nry grinder, a. pocket, a, for ifmrr fur p' ing the msrrriai rn in@ ground against the grimirr, :md u gaie Tar guard 'for His: 'pocket aiitmxmrically moved toward ihr grinder heid in close Camaret therewirh iirmig'limzt iii@ Grinding! npernrion.

i2. A. puigrwmd grinding machine. c0m- Wiring: :z Winry grinder, a pocket, aioiifwrrr for prr-ssing the imitul'iai t0 bie ground ngrnii'nlz; 'iie grrimirr, u gmt@ or guard-rar rile f-friiiim', a wooden iiriirig for th? pfrzke'r, unici means for pressmg du; lining: imo wir@ @uninet wlii Vn@ grinder throughwu rire grinding operation.

A @nip-Wood grinding; nfisichinr.,v com L'prifsiing ii, roary grinder, :i pricire,

'ihr the pocker, ami mechanism for :aimait:

(i i grinding; mnriiinel www primair :i roary grir im'. n pm-kot provided .wrih ver'iriai, guidi; ubi-. n wunder gate or .smirfi @warrig :if mi mid ribs; and heid in i i me grinder, 'iirougriiout 'rnfz am! :i nliower for l im? in he grmmd against *.Twiifii ;iwiing muchimu cmurii'iricr, a pocket, a fob 3 mirarla! to he ,ground immrm l against the grinder, anni a Wiper outsie the pocket iwiri in, ds@ grinding Contact with the grinrier iur-ing th@ grinding operation.

8. 'pni'pvwood grinding machine, c0mprising a, roiiry grinder, a, series of pockets :irraiiged rafiiaiiy with reference lieretfi, means Within the pockets Oriioiding he 'maferiai fr: be ground in .mutant with the grinder, Miri Woriciei Wiper interponsec iwweoii mi) zieijacrni, 'podreis and heid in grinding; cmitact with the grinder for rra:- w'riiring ,'rmm mater-ini. frGm passing from one pmiket t@ smnrher. v

9. A puipwccd grinding machine, con prising rG'ral'y grinder, a casing' therefor. brfige trees crmrating the opposite. sic'ics of iii@ casing'anri inerposrd between the pockeis, mi' Wipe-ris arranged radiaiijf in tix bridge rees and .fautmmiticaliy pres ,d in

diosa grinding commer, with the grinder Fmr ing the gridirig Qperatimi.

10. A puipwro'od lgrinding machine. mmpriesing a rotary grinder, a pori-zet., :r

"Lwrve'r for pressing 'he .maeriai io he grmmri against the grinfie?, a gaie @r gmini of grimia'hie mzieriai for the wicker, :mii means Operating infiependeniy of the '50iin'wer for antamairaiy pressing che gaie or guardi agaimit vih@ periiphery of the grinder throughout rire grinding operation.

lil. A, pg11p-w0od grimiirig machine. compris-ing u roiary grinder, i1 fcirfe. in foi imver for pressing" the marrrini to he gi-mirri. ugninfsr the grinena Wnorirm gaie 'for prvvenqiing the Qcfrpe 0f imground materiali from the qiocl'ret, a iiopprer conneced with the poriret, muri means for feeding materiai o be ground from H19 hopper ro die pocket 1Q, ik pulp-wood grinding' machin-u, cmunriging n rotary grinfiieri a pmkr., n foiirwer for pressing the romera! t@ be ground :ignins' the, grinder, n, Wnnien grrr@ 0r guard for H1@ Wicket iieir'i in cios@ confn ct vri'h the Hindu` during' rh@ grining operation for prm'ruting iir rampa@ m? imgrmuni n'mierini from ibcporzizet. l -hopprr eomiccteri with ihe pocker. sami means for feeding material 'nies 'to be ground :from thrfimpper i0 the pocket. 

